Update "File Thumbnails"

- Rename from "Thumbnails" to prevent a XML tag clash with Jingle
  Content Thumbnails
- Prepend a "proto:" to the chosen xmlns to prevent issues with live
  XEPs
- Add information about this not-really-proto XEP

xep-xxxx-file-thumbnails.md

@@ -1,4 +1,4 @@
-# Thumbnails
+# File Thumbnails
 ## Introduction
 
 When sending media, it is often helpful for users when a thumbnail can be shown before the
@@ -14,42 +14,43 @@ This document specifies are more general and extensible element for specifiying
 ## Usage
 
 ```xml
-<thumbnail type="blurhash" xmlns="urn:xmpp:thumbnail:0">
+<file-thumbnail type="proto:urn:xmpp:file-thumbnails:0:blurhash" xmlns="proto:urn:xmpp:file-thumbnails:0">
-	<payload>LEHV6nWB2yk8pyoJadR*.7kCMdnj</payload>
+	<blurhash>LEHV6nWB2yk8pyoJadR*.7kCMdnj</blurhash>
 </thumbnail>
 ```
 
-In this example, the thumbnail is specified of type `blurhash`, which means that a supporting
+In this example, the thumbnail is specified of type `proto:urn:xmpp:file-thumbnails:0:blurhash`, which means that a supporting
-client should decode the `<payload/>` element using the [Blurhash](https://github.com/woltapp/blurhash) algorithm.
+client should decode the `<blurhash/>` element using the [Blurhash](https://github.com/woltapp/blurhash) algorithm.
 
 In order to enable a sort-of interoperability with [Jingle Content Thumbnails](https://xmpp.org/extensions/xep-0264.html), a type
-`urn:xmpp:thumbs:0` is defined. If this is specified, then a supporting client must
+`proto:urn:xmpp:file-thumbnails:0:jct` is defined.
-interpret the child of the `<payload />` as an `<thumbnail />` element as specified by
-:[Jingle Content Thumbnails](https://xmpp.org/extensions/xep-0264.html)
 
-```
+```xml
-<thumbnail type="urn:xmpp:thumbs:1" xmlns="urn:xmpp:thumbnail:0">
+<file-thumbnail type="proto:urn:xmpp:file-thumbnails:0:jct" xmlns="proto:urn:xmpp:file-thumbnails:0">
-	<payload>
 	<thumbnail xmlns="urn:xmpp:thumbs:1" uri="..." media-type="image/png" width="128" height="96" />
-	</payload>
 </thumbnail>
 ```
 
 In the case of [Jingle Content Thumbnails](https://xmpp.org/extensions/xep-0264.html) compatibility,
-the `<payload />` element must contain exactly one `<thumbnail xmlns="urn:xmpp:thumbs:1" />` element.
+the `<file-thumbnail />` element must contain exactly one `<thumbnail xmlns="urn:xmpp:thumbs:1" />` element.
 
-Other extensions may define similar types. Note that the content of the `<payload />` element
+Other extensions may define similar types. Note that the content of the `<file-thumbnail />` element
-is dependent on the type specified in the `<thumbnail xmlns="urn:xmpp:thumbnail:0" />`
+is dependent on the type specified in the `<file-thumbnail xmlns="proto:urn:xmpp:file-thumbnails:0" />`
 element.
 
 ### Thumbnail Types
 #### Blurhash
 
-If a sender specifies the type to be of `blurhash`, then the payload must contain the
+If a sender specifies the type to be of `proto:urn:xmpp:file-thumbnails:0:blurhash`, then the `<file-thumbnail />` element must contain the
 image data as specified by the [Blurhash](https://github.com/woltapp/blurhash) algorithm. Care should be taken to prevent
 the blurhash data from growing to large in order to prevent hitting the stanza size limit.
 
-## Usage with Stateless Inline Media Sharing
+### Jingle Content Thumbnail Compatability
+
+If a sender specified the type to be of `proto:urn:xmpp:file-thumbnails:0:jct`, then the `<file-thumbnail />`
+element must contain exactly one `<thumbnail xmlns="urn:xmpp:thumbs:1" />` element.
+
+## Usage Example with Stateless Inline Media Sharing
 
 NOTE: This example is taken from [Stateless Inline Media Sharing](https://xmpp.org/extensions/xep-0385.html) and modified for this protocol.
 
@@ -65,13 +66,13 @@ NOTE: This example is taken from [Stateless Inline Media Sharing](https://xmpp.o
         <hash xmlns='urn:xmpp:hashes:2' algo='sha3-256'>2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=</hash>
         <hash xmlns='urn:xmpp:hashes:2' algo='id-blake2b256'>2AfMGH8O7UNPTvUVAM9aK13mpCY=</hash>
         <desc>Photo from the summit.</desc>
-        <thumbnail type="urn:xmpp:thumbs:1" xmlns='urn:xmpp:thumbnail:0'>
+        <file-thumbnail type="proto:proto:urn:xmpp:file-thumbnails:0:jct" xmlns='urn:xmpp:thumbnail:0'>
 		  	<payload>
 				<thumbnail xmlns='urn:xmpp:thumbs:1'uri='cid:sha1+ffd7c8d28e9c5e82afea41f97108c6b4@bob.xmpp.org' media-type='image/png' width='128' height='96'/>
 			</payload>
 		</thumbnail>
-        <thumbnail type="blurhash" xmlns='urn:xmpp:thumbnail:0'>
+        <file-thumbnail type="proto:urn:xmpp:file-thumbnails:0:blurhash" xmlns='proto:urn:xmpp:file-thumbnails:0'>
-		  	<payload>LEHV6nWB2yk8pyoJadR*.7kCMdnj</payload>
+		  	<blurhash>LEHV6nWB2yk8pyoJadR*.7kCMdnj</blurhash>
 		</thumbnail>
       </file>
       <sources>
@@ -86,3 +87,10 @@ NOTE: This example is taken from [Stateless Inline Media Sharing](https://xmpp.o
 ## Security Considerations
 
 The same considerations apply as specified by [Jingle Content Thumbnails](https://xmpp.org/extensions/xep-0264.html).
+
+## Info
+
+| Key | Value |
+| --- | --- |
+| Author | PapaTutuWawa |
+| Version | 0.0.2 |